<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"  
  "http://www.w3.org/TR/html4/loose.dtd">  
<html > 
<head><title>The VDisplay class</title> 
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 
<meta name="generator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)"> 
<meta name="originator" content="TeX4ht (http://www.cse.ohio-state.edu/~gurari/TeX4ht/)"> 
<!-- 3,html --> 
<meta name="src" content="vipsmanual.tex"> 
<meta name="date" content="2010-06-09 21:39:00"> 
<link rel="stylesheet" type="text/css" href="vipsmanual.css"> 
</head><body 
>
  <!--l. 1--><div class="crosslinks"><p class="noindent">[<a 
href="vipsmanualse6.html" >next</a>] [<a 
href="vipsmanualse4.html" >prev</a>] [<a 
href="vipsmanualse4.html#tailvipsmanualse4.html" >prev-tail</a>] [<a 
href="#tailvipsmanualse5.html">tail</a>] [<a 
href="vipsmanualch1.html#vipsmanualse5.html" >up</a>] </p></div>
  <h3 class="sectionHead"><span class="titlemark">1.5    </span> <a 
 id="x10-270001.5"></a>The <span 
class="pcrr7t-">VDisplay </span>class</h3>
<!--l. 3--><p class="noindent" >The <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">VDisplay</span></span></span> class is an abstraction over the VIPS
<span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">im_col_display</span></span></span> type which gives convenient and safe
representation of VIPS display profiles.
<!--l. 6--><p class="indent" >  VIPS display profiles are now mostly obsolete. You&#8217;re
better off using the ICC colour management <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">VImage</span></span></span>
member functions <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ICC_export()</span></span></span> and <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">ICC_import()</span></span></span>.
<!--l. 10--><p class="noindent" >
  <h4 class="subsectionHead"><span class="titlemark">1.5.1    </span> <a 
 id="x10-280001.5.1"></a>Constructors</h4>
<!--l. 12--><p class="noindent" >There are two constructors for <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">VDisplay</span></span></span>:
                                                 <div class="verbatim" id="verbatim-36">
  VDisplay(&#x00A0;const&#x00A0;char&#x00A0;&#x22C6;name&#x00A0;);
 &#x00A0;<br />VDisplay(); 
</div>
<!--l. 17--><p class="nopar" >
<!--l. 19--><p class="indent" >  The first form initialises the display from one of the
standard VIPS display types. For example:
                                                                                       

                                                                                       
  <div class="verbatim" id="verbatim-37">
VDisplay&#x00A0;fred(&#x00A0;"sRGB"&#x00A0;);
&#x00A0;<br />VDisplay&#x00A0;jim(&#x00A0;"ultra2-20/2/98"&#x00A0;);
</div>
<!--l. 25--><p class="nopar" >
<!--l. 27--><p class="indent" >  Makes <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">fred</span></span></span> a profile for making images in sRGB
format, and <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">jim</span></span></span> a profile representing my workstation
display, as of 20/2/98. The second form of constructor
makes an uninitialised display.
<!--l. 31--><p class="noindent" >
  <h4 class="subsectionHead"><span class="titlemark">1.5.2    </span> <a 
 id="x10-290001.5.2"></a>Projection functions</h4>
<!--l. 33--><p class="noindent" >A set of member functions of <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">VDisplay</span></span></span> provide read and
write access to the fields in the display.
                                                 <div class="verbatim" id="verbatim-38">
  char&#x00A0;&#x22C6;name();
 &#x00A0;<br />VDisplayType&#x00A0;&amp;type();
 &#x00A0;<br />matrix&#x00A0;&amp;mat();
 &#x00A0;<br />float&#x00A0;&amp;YCW();
 &#x00A0;<br />float&#x00A0;&amp;xCW();
 &#x00A0;<br />float&#x00A0;&amp;yCW();
 &#x00A0;<br />float&#x00A0;&amp;YCR();
 &#x00A0;<br />float&#x00A0;&amp;YCG();
 &#x00A0;<br />float&#x00A0;&amp;YCB();
 &#x00A0;<br />int&#x00A0;&amp;Vrwr();
 &#x00A0;<br />int&#x00A0;&amp;Vrwg();
 &#x00A0;<br />int&#x00A0;&amp;Vrwb();
 &#x00A0;<br />float&#x00A0;&amp;Y0R();
 &#x00A0;<br />float&#x00A0;&amp;Y0G();
 &#x00A0;<br />float&#x00A0;&amp;Y0B();
 &#x00A0;<br />float&#x00A0;&amp;gammaR();
 &#x00A0;<br />float&#x00A0;&amp;gammaG();
 &#x00A0;<br />float&#x00A0;&amp;gammaB();
 &#x00A0;<br />float&#x00A0;&amp;B();
 &#x00A0;<br />float&#x00A0;&amp;P(); 
</div>
<!--l. 57--><p class="nopar" >
<!--l. 59--><p class="indent" >  Where <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">VDisplayType</span></span></span> is defined as:
                                                                                       

                                                                                       
  <div class="verbatim" id="verbatim-39">
enum&#x00A0;VDisplayType&#x00A0;{
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;BARCO,
&#x00A0;<br />&#x00A0;&#x00A0;&#x00A0;&#x00A0;DUMB
&#x00A0;<br />};
</div>
<!--l. 66--><p class="nopar" >
<!--l. 68--><p class="indent" >  And <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">matrix</span></span></span> is defined as:
                                                 <div class="verbatim" id="verbatim-40">
  typedef&#x00A0;float&#x00A0;matrix[3][3]; 
</div>
<!--l. 72--><p class="nopar" >
<!--l. 74--><p class="indent" >  For a description of all the fields in a VIPS display
profile, see the manual page for <span class="obeylines-h"><span class="verb"><span 
class="pcrr7t-">im_XYZ2RGB()</span></span></span>.
                                                                                       

                                                                                       
  <!--l. 1--><div class="crosslinks"><p class="noindent">[<a 
href="vipsmanualse6.html" >next</a>] [<a 
href="vipsmanualse4.html" >prev</a>] [<a 
href="vipsmanualse4.html#tailvipsmanualse4.html" >prev-tail</a>] [<a 
href="vipsmanualse5.html" >front</a>] [<a 
href="vipsmanualch1.html#vipsmanualse5.html" >up</a>] </p></div>
<!--l. 1--><p class="indent" >  <a 
 id="tailvipsmanualse5.html"></a>   
</body></html>